diff --git a/.Lib9c.Tests/Action/ItemEnhancementTest.cs b/.Lib9c.Tests/Action/ItemEnhancementTest.cs
index 7bf9e0d824..a5883993fd 100644
--- a/.Lib9c.Tests/Action/ItemEnhancementTest.cs
+++ b/.Lib9c.Tests/Action/ItemEnhancementTest.cs
@@ -432,7 +432,7 @@ public void Execute_With_Hammer(bool oldStart)
             _avatarState.inventory.AddItem(
                 ItemFactory.CreateMaterial(_tableSheets.MaterialItemSheet[hammerId]), 3);
 
-            var hammerExp = Equipment.GetHammerExp(hammerId, _tableSheets.EnhancementCostSheetV3) * 3;
+            var hammerExp = _tableSheets.EnhancementCostSheetV3.GetHammerExp(hammerId) * 3;
 
             var result = new CombinationConsumable5.ResultModel()
             {
diff --git a/.Lib9c.Tests/Model/Item/EquipmentTest.cs b/.Lib9c.Tests/Model/Item/EquipmentTest.cs
index e40e560db2..78c8c28b24 100644
--- a/.Lib9c.Tests/Model/Item/EquipmentTest.cs
+++ b/.Lib9c.Tests/Model/Item/EquipmentTest.cs
@@ -83,7 +83,7 @@ public void GetHammerExp()
             {
                 var id = costRow.Id;
                 Assert.True(costRow.Exp > 0L);
-                Assert.Equal(costRow.Exp, Equipment.GetHammerExp(id, costSheet));
+                Assert.Equal(costRow.Exp, costSheet.GetHammerExp(id));
             }
         }
     }
diff --git a/Lib9c/Action/ItemEnhancement.cs b/Lib9c/Action/ItemEnhancement.cs
index 26bae16d55..ab726465aa 100644
--- a/Lib9c/Action/ItemEnhancement.cs
+++ b/Lib9c/Action/ItemEnhancement.cs
@@ -336,7 +336,7 @@ public override IWorld Execute(IActionContext context)
             {
                 if (avatarState.inventory.RemoveMaterial(hammerId, context.BlockIndex, hammerCount))
                 {
-                    var exp = Equipment.GetHammerExp(hammerId, enhancementCostSheet);
+                    var exp = enhancementCostSheet.GetHammerExp(hammerId);
                     hammerExp += exp * hammerCount;
                 }
                 else
diff --git a/Lib9c/Model/Item/Equipment.cs b/Lib9c/Model/Item/Equipment.cs
index a8b02be9b6..3e0493f98a 100644
--- a/Lib9c/Model/Item/Equipment.cs
+++ b/Lib9c/Model/Item/Equipment.cs
@@ -222,11 +222,6 @@ public long GetRealExp(EquipmentItemSheet itemSheet, EnhancementCostSheetV3 cost
                 r.Level == level).Exp;
         }
 
-        public static long GetHammerExp(int hammerId, EnhancementCostSheetV3 costSheet)
-        {
-            return costSheet[hammerId].Exp;
-        }
-
         public List<object> GetOptions()
         {
             var options = new List<object>();
diff --git a/Lib9c/TableData/Cost/EnhancementCostSheetV3.cs b/Lib9c/TableData/Cost/EnhancementCostSheetV3.cs
index b4834bc9f9..903b1b36f0 100644
--- a/Lib9c/TableData/Cost/EnhancementCostSheetV3.cs
+++ b/Lib9c/TableData/Cost/EnhancementCostSheetV3.cs
@@ -38,5 +38,10 @@ public override void Set(IReadOnlyList<string> fields)
         public EnhancementCostSheetV3() : base(nameof(EnhancementCostSheetV2))
         {
         }
+
+        public long GetHammerExp(int hammerId)
+        {
+            return this[hammerId].Exp;
+        }
     }
 }